Subprime mortgage crisis - Wikipedia, the free encyclopediaThe U.S. subprime mortgage crisis was one of the first indicators of the late- 2000s . in 23% of U.S. homes worth less than the mortgage loan by September 2010, . non-federally chartered housing creditors to write adjustable-rate mortgages. . banks moved an estimated $5.2 trillion in assets and liabilities off- balance .http://en.wikipedia.org/wiki/Subprime_mortgage_crisis